/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineSubsystemTypes.h
Id of a party instance
class FOnlinePartyId : public [IOnlinePlatformData](API\Plugins\OnlineSubsystem\IOnlinePlatformData), public [TSharedFromThis< FOnlinePartyId >](API\Runtime\Core\Templates\TSharedFromThis)